I have a dream that someday there would be a fully AI-based procedurally generated open world RPG. From crafting a main quest down to "oh, shit, I didn't expect you to try to break into this rando's house, I guess I need to generate a floorplan map and residents and their personalities and their schedules and their jobs and life stories and friends and extended family and where those people might live in the world and and and and..."

Like playing, in real time, a tabletop RPG where the GM was literally making it all up on the fly.